convex lens of focal length 10 cm is placed in closed contact with a concave lens of focal length 10 cm. The power of combination is
20 D
10 D
40 D
Zero
Answers
Answered by
0
Answer:
Answer
Correct option is
B
+20cm
Given,
f
1
=+10cm for convex lens
f
2
=−20cm for concave lens
The focal length of the combination is given by
f
1
=
f
2
1
+
f
2
1
f
1
=
+10cm
1
+
−20cm
1
=
20cm
1
f=+20cm
The correct option is B.
Answered by
1
Explanation:
zero is ur answer
mark me as brainliest
Similar questions